User terminal, radio base station, and radio communication method

Abstract

For the purpose of preventing transmission of UL signals in a subframe other than a UL subframe during the fallback operation in Dynamic TDD communication, the present invention provides a user terminal for communicating in Dynamic TDD, the user terminal having: a reception section that receives control information including an indication to dynamically change a subframe configuration of a Dynamic TDD cell and a control section that controls not to perform specific resource transmission in flexible subframes in the fallback operation based on the subframe configuration of Dynamic TDD cell signaled by higher layers or SIB1.

The invention claimed is: 
     
       1. A user terminal comprising:
 a reception section that receives control information including a subframe configuration of a TDD (Time Division Duplex) cell signaled by L1 signaling; and 
 a control section that, when the user terminal does not detect the subframe configuration signaled by L1 signaling, controls to stop transmission of sounding reference signals in a subframe to which transmission of an uplink shared channel is not allocated by uplink grant. 
 
     
     
       2. The use terminal according to  claim 1 , wherein the subframe is indicated as a downlink subframe in a subframe configuration signaled by higher layers. 
     
     
       3. The use terminal according to  claim 1 , wherein the sounding reference signals are resources that are transmitted periodically. 
     
     
       4. A radio base station comprising:
 a transmission section that transmits a control signal including a subframe configuration of a TDD (Time Division Duplex) cell by L1 signaling; and 
 a reception section that receives sounding reference signals from a user terminal, 
 wherein when the user terminal does not detect the subframe configuration signaled by L1 signaling, the reception section does not receive the sounding reference signals in a subframe to which transmission of an uplink shared channel is not allocated by uplink grant. 
 
     
     
       5. A radio communication method for a user terminal communicating in eIMTA (enhanced Interference Management and Traffic Adaptation), the radio communication method comprising the steps of:
 receiving control information including a subframe configuration of a TDD (Time Division Duplex) cell signaled by L1 signaling; and 
 when the user terminal does not detect the subframe configuration signaled by L1 signaling, controlling to stop transmission of sounding reference signals in a subframe to which transmission of an uplink shared channel is not allocated by uplink grant. 
 
     
     
       6. A radio communication system comprising a radio base station and a user terminal communicating in eIMTA (enhanced Interference Management and Traffic Adaptation),
 the user terminal comprising a
 a reception section that receives control information including a subframe configuration of a TDD (Time Division Duplex) cell signaled by L1 signaling; and 
 a control section that, when the user terminal does not detect the subframe configuration signaled by L1 signaling, controls to stop transmission of sounding reference signals in a subframe to which transmission of an uplink shared channel is not allocated by uplink grant.